In order to register your child for the 2020 season you must first sign up for an NRL account.
You will need to go to the NRL Account Log in page, select the sign up link at the bottom of the page and complete the form to register your account.
When you login, provided you use the same email address you have used to register your child via MyNRL previously, your childs details will appear for you to select for registration.
If you have previously signed up for any NRL digital services (eg. NRL Tipping or NRL Supercoach) you may already have an NRL account and if so, you can still login with your email address.